本文旨在以實驗量測方式探討在毫米流道熱沉孔間流過包含純水、奈米流體、相變化微膠囊懸浮液，與奈米顆粒/相變化微膠囊混合懸浮液等四種不同工作流體的強制對流熱傳特性。實驗所製作的毫米流道熱沉之材料為紅銅，共有10條寬1mm、高1.5mm、長50mm的流道，其水力直徑為1.2mm，。毫米流道熱沉底部係黏置加熱片以模擬等熱通量加熱邊界條件，強制對流實驗之雷諾數範圍介於133-1515間。本文使用的相變化材料微粒係內包二十烷之膠囊，所調配之相變化微粒懸浮液其含相變化材料質量濃度計有0%、2%、5%、10%；奈米流體內含之奈米氧化鋁顆粒之質量濃度為0%、2%、4%、6%、8%、10%。熱傳實驗結果顯示，相較純水，奈米流體在最高流量流經毫米流道熱沉時，其平均熱傳係數增益可達57%，且其壓降僅小幅度提升11%；另一方面，相變化微粒懸浮液則在以最低流量時，可有效提升平均熱傳係數51%，但大幅度提升壓降71%。以奈米顆粒/相變化微膠囊混合懸浮液為毫米流道熱沉之工作流體時，實驗數據充分顯示可發揮奈米顆粒/相變化微膠囊互補功效，致使熱沉之熱溢散效率在各流量下皆有良好的提升，其最佳熱傳係數增益可進一步提升56%。

In the present study, experimental efforts have been undertaken to explore the forced convection heat transfer efficacy of using water-based suspensions of alumina nanoparticles (nanofluid) and/or microencapsulated phase change material (MEPCM) particles (PCM suspension) to replace the pure water as the working fluids in a minichannel heat sink. The heatsink fabricated from copper consists of 10 rectangular minichannels, each of which has a width of 1mm, a depth of 1.5mm, a length of 50mm, having a hydraulic diameter of 1.2mm. The minichannel heatsink was heated with a uniform base heat flux in the experiments with the Reynolds numbers ranged from 133 to 1515. The mass fractions of the nanoparticles and MEPCM particles dispersed in the water-based suspensions were in the ranges of 2-10 wt.%, respectively. Experimental results obtained reveal that the heat dissipation effectiveness of the nanofluid and PCM suspension depends significantly on their flow rates through the heatsink. For the nanofluid, the highest enhancement of 57 % in the averaged heat transfer coefficient was detected under the highest flow rate; while for the PCM suspension, the highest enhancement of 51% under the lowest flow rate. For the hybrid water-based suspensions, the effect of simultaneous dispersion of the nanoparticles and MEPCM particles in water appears to be supplementary with added benefit of simultaneous increases in the effective thermal conductivity and specific heat such that the heat transfer effectiveness could be further increased up to 56% with little dependence on the flow rate.

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